in this assignment, you will define a simple student class. each student object contains a name (string), and two exam grades (floats or integers). you will always supply a name when you create the class, and also may supply one or both of the exam grades. if you don't supply an exam grade, it should default to none (indicating that that grade is not yet been recorded). you do not need to validate the exam scores entered by the user; you can assume that they are numbers (integer or float), though the numbers can be arbitrary and can even be negative. you should also be able to return the student's average, assuming both exam scores are available. define a str method so that you can print the student information in a nice format.
